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<p>The present study emphasizes the innovative techniques of ground improvement through prefabricated vertical drains, dictated by undulated stratified subsurface. A plane-strain finite element (FE) analysis is carried out for the case of Udaipur railway embankment constructed over stratified undulated subsoil improved with prefabricated vertical drains (PVDs). Mohr-Coulomb (MC) constitutive model is used for representing the embankment and cohesionless layers, while the soft cohesive soils are represented using Soft Soil (SS) model. The PVDs are modelled by considering the smear effect and neglecting the well resistance. The study elucidates the improved embankment stability and expedited excess pore water pressure dissipation with implementation of PVDs across the lateral and vertical extent governed by variability of stratified undulations. In the present study, the EPWP reduction is enhanced by 80% for PVDs extended vertically and laterally with expedited degree of consolidation by 34–49%. Further, the benefit of amalgamating the hybridized spacing and geosynthetic basal reinforcement is also highlighted. In this case, the vertical settlement is observed to be reduced by 20% by implementing hybrid spacing between the PVDs assisted by geotextile basal reinforcement beneath the embankment.</p>

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Response of Udaipur Railway Embankment Supported by PVD-treated Spatially Heterogenous Marshy Deposit

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Samrat Ghose,
  • Arindam Dey

摘要

The present study emphasizes the innovative techniques of ground improvement through prefabricated vertical drains, dictated by undulated stratified subsurface. A plane-strain finite element (FE) analysis is carried out for the case of Udaipur railway embankment constructed over stratified undulated subsoil improved with prefabricated vertical drains (PVDs). Mohr-Coulomb (MC) constitutive model is used for representing the embankment and cohesionless layers, while the soft cohesive soils are represented using Soft Soil (SS) model. The PVDs are modelled by considering the smear effect and neglecting the well resistance. The study elucidates the improved embankment stability and expedited excess pore water pressure dissipation with implementation of PVDs across the lateral and vertical extent governed by variability of stratified undulations. In the present study, the EPWP reduction is enhanced by 80% for PVDs extended vertically and laterally with expedited degree of consolidation by 34–49%. Further, the benefit of amalgamating the hybridized spacing and geosynthetic basal reinforcement is also highlighted. In this case, the vertical settlement is observed to be reduced by 20% by implementing hybrid spacing between the PVDs assisted by geotextile basal reinforcement beneath the embankment.